Transcript

00:00:02

>> It's his second Olympic victory in Rio and Usain Bolt made it look easy. The world's fastest sprinter laying waste to the competition on Thursday to grab the title for the men's 200 meters. The victory keeps the Jamaican on course for a triple, triple or three gold medals at three Olympics.

00:00:18

The last race standing between Bolt and his goal, the four by 100 meters relay on Friday. And Britain's Brownlee brothers did it together, beating the heat to take the top two spots in the triathlon. 28 year old Alistair winning gold, the first triathlete to take the title twice in a row.

00:00:35

Younger brother Johnny was right on his heels. American, Ryan Crowser hurled the longest throw of his life to win the men's shotput final, breaking the Olympic record and snatching gold in his first major competition. A young victory poolside, 15-year-old Ren Qian claiming gold in the ten meter platform, giving China a clean sweep of the champion titles in the women's diving events.

00:00:59

And as the Olympics enter the final stretch, the doping cases are piling up. Bronze medalist weightlifter Izzat Artykov from Kyrgyzstan, the first athlete to be stripped of a Rio title when he was found with strychnine in his system. Also used as rat poison, the substance has been taken as a performance enhancer.